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Biology

Purdue Online Writing Lab

Logo for Purdue Online Writing Lab

The Online Writing Lab (OWL) at Purdue University houses writing resources and instructional material as a free service of the Writing Lab at Purdue. Students, members of the community, and users worldwide are welcome to use OWL for information to assist with writing projects. 

OWL has extensive examples, explanations and tutorials on all citation styles, including APA, MLA and Chicago.  If you have a citation question, it's almost certain you'll find your answer on OWL.

APA Citations

Scientific Style Citations

Citation Management System - Zotero